:root{
      --bg:#fffaf4;
      --panel:#ffffff;
      --panel2:#fff4ec;
      --text:#1f2937;
      --muted:#5b6472;
      --line:#eadfd3;
      --brand:#ff6b35;
      --brand2:#ffb703;
      --accent:#2563eb;
      --green:#0f9d58;
      --shadow:0 18px 40px rgba(31,41,55,.08);
      --radius:22px;
      --radius-sm:16px;
      --max:1180px;
    }
    *{box-sizing:border-box}
    html{scroll-behavior:smooth}
    body{margin:0;font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;background:linear-gradient(180deg,#fff8ef 0%,#fffdfb 30%,#fff7ef 100%);color:var(--text);line-height:1.6}
    a{color:inherit;text-decoration:none}
    img{display:block;max-width:100%}
    .container{width:min(var(--max),calc(100% - 32px));margin:0 auto}
    .site-header{position:sticky;top:0;z-index:50;background:rgba(255,250,244,.88);backdrop-filter:blur(14px);border-bottom:1px solid rgba(234,223,211,.8)}
    .nav{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 0}
    .brand{display:flex;align-items:center;gap:12px;min-width:0}
    .brand .ai-page-logo{width:44px;height:44px;object-fit:contain;border-radius:12px;background:#fff;border:1px solid var(--line);padding:4px;box-shadow:0 8px 20px rgba(255,107,53,.08)}
    .brand strong{display:block;font-size:18px;line-height:1.15}
    .brand span{display:block;font-size:12px;color:var(--muted)}
    .menu{display:flex;align-items:center;gap:18px;flex-wrap:wrap;justify-content:flex-end}
    .menu a{font-size:14px;color:#374151;padding:8px 10px;border-radius:999px;transition:.2s}
    .menu a:hover,.menu a.active{background:#fff;color:var(--brand);box-shadow:0 6px 18px rgba(255,107,53,.12)}
    .nav-actions{display:flex;align-items:center;gap:10px}
    .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 18px;border-radius:999px;border:1px solid transparent;font-weight:700;transition:.2s;cursor:pointer}
    .btn-primary{background:linear-gradient(135deg,var(--brand),#ff8a4c);color:#fff;box-shadow:0 14px 28px rgba(255,107,53,.22)}
    .btn-primary:hover{transform:translateY(-2px)}
    .btn-ghost{background:#fff;border-color:var(--line);color:var(--text)}
    .btn-ghost:hover{border-color:var(--brand);color:var(--brand)}
    .nav-toggle{display:none;background:#fff;border:1px solid var(--line);border-radius:12px;padding:10px 12px}
    .hero{padding:34px 0 18px}
    .hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:22px;align-items:stretch}
    .hero-main{position:relative;overflow:hidden;background:linear-gradient(135deg,#111827 0%,#1f3c88 50%,#ff6b35 100%);color:#fff;border-radius:30px;padding:34px;box-shadow:var(--shadow)}
    .hero-main::before,.hero-main::after{content:"";position:absolute;border-radius:50%;background:rgba(255,255,255,.12);filter:blur(2px)}
    .hero-main::before{width:170px;height:170px;right:-35px;top:-35px}
    .hero-main::after{width:220px;height:220px;left:-70px;bottom:-110px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border-radius:999px;background:rgba(255,255,255,.12);font-size:13px}
    h1{margin:14px 0 12px;font-size:clamp(32px,5vw,54px);line-height:1.06}
    .hero p{margin:0;color:rgba(255,255,255,.88);font-size:16px;max-width:56ch}
    .hero-cta{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}
    .hero-meta{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:26px}
    .mini-stat{padding:14px 16px;border-radius:18px;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.16)}
    .mini-stat strong{display:block;font-size:20px}
    .mini-stat span{font-size:13px;color:rgba(255,255,255,.82)}
    .hero-side{display:grid;gap:16px}
    .side-card,.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
    .side-card{padding:22px}
    .side-card h2{margin:0 0 10px;font-size:20px}
    .tag-cloud{display:flex;flex-wrap:wrap;gap:10px}
    .tag{padding:8px 12px;border-radius:999px;background:#fff7f2;border:1px solid #ffd9c7;color:#a63d12;font-size:13px}
    .hero-links{display:flex;flex-wrap:wrap;gap:12px;margin-top:16px}
    .hero-links a{font-weight:700;color:var(--accent)}
    section{padding:18px 0}
    .section-head{display:flex;justify-content:space-between;align-items:end;gap:16px;margin-bottom:16px}
    .section-head h2{margin:0;font-size:28px}
    .section-head p{margin:0;color:var(--muted);max-width:70ch}
    .grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
    .grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
    .grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
    .metric,.service,.case,.review,.article,.faq-item,.timeline-item{padding:20px;border-radius:22px;background:var(--panel);border:1px solid var(--line);box-shadow:var(--shadow)}
    .metric strong{display:block;font-size:26px;color:var(--brand)}
    .metric span,.service p,.review p,.article p,.case p{color:var(--muted)}
    .service h3,.case h3,.review h3,.article h3,.timeline-item h3{margin:0 0 8px;font-size:18px}
    .service .badge{display:inline-flex;margin-bottom:12px;padding:7px 10px;background:#fff3eb;border-radius:999px;color:#c2410c;font-size:12px;font-weight:700}
    .story{display:grid;grid-template-columns:1fr 1fr;gap:16px;align-items:stretch}
    .panel{padding:24px;border-radius:24px;background:linear-gradient(180deg,#fff 0%,#fffaf6 100%);border:1px solid var(--line);box-shadow:var(--shadow)}
    .flow{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
    .flow .step{position:relative;padding:18px;border-radius:20px;background:#fff;border:1px solid var(--line)}
    .flow .step strong{display:inline-flex;width:34px;height:34px;border-radius:50%;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;margin-bottom:10px}
    .compare-wrap{overflow-x:auto;border-radius:20px;border:1px solid var(--line);background:var(--panel);box-shadow:var(--shadow)}
    table{width:100%;border-collapse:collapse;min-width:860px}
    th,td{padding:16px;border-bottom:1px solid #efe6dc;text-align:left;vertical-align:top}
    th{background:#fff7f0;color:#7c2d12}
    .rating{display:flex;gap:4px;color:#f59e0b;font-size:18px}
    .faq{display:grid;gap:12px}
    .faq-item summary{list-style:none;cursor:pointer;font-weight:700}
    .faq-item summary::-webkit-details-marker{display:none}
    .faq-item .answer{padding-top:10px;color:var(--muted)}
    .contact-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:16px;align-items:start}
    form{display:grid;gap:12px}
    label{font-size:14px;font-weight:700}
    input,select,textarea{width:100%;border:1px solid var(--line);border-radius:14px;padding:13px 14px;font:inherit;background:#fff;color:var(--text);outline:none;transition:.2s}
    input:focus,select:focus,textarea:focus{border-color:var(--brand);box-shadow:0 0 0 4px rgba(255,107,53,.12)}
    textarea{min-height:118px;resize:vertical}
    .footer{margin-top:18px;padding:22px 0 28px;border-top:1px solid var(--line);background:#fff}
    .footer-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:16px}
    .footer p,.footer a,.footer li{color:#4b5563}
    .footer h3{margin:0 0 10px}
    .footer-links{display:flex;flex-wrap:wrap;gap:10px}
    .footer-links a{padding:8px 12px;border-radius:999px;background:#faf7f3;border:1px solid var(--line)}
    .fixed-tools{position:fixed;right:18px;bottom:18px;display:grid;gap:10px;z-index:60}
    .tool{width:52px;height:52px;border-radius:18px;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--brand),#ff8a4c);color:#fff;box-shadow:0 14px 24px rgba(255,107,53,.22)}
    .floating-contact{position:fixed;left:18px;bottom:18px;z-index:60;max-width:290px;background:#fff;border:1px solid var(--line);border-radius:22px;box-shadow:var(--shadow);padding:14px}
    .floating-contact .row{display:flex;gap:12px;align-items:center}
    .floating-contact img{width:86px;height:86px;object-fit:cover;border-radius:16px;border:1px solid var(--line)}
    .floating-contact small{color:var(--muted)}
    .scroll-reveal{opacity:0;transform:translateY(18px);transition:.7s ease}
    .scroll-reveal.in-view{opacity:1;transform:none}
    .hero-main,.side-card,.metric,.service,.case,.review,.article,.faq-item,.timeline-item,.panel{transition:transform .2s ease, box-shadow .2s ease}
    .hero-main:hover,.side-card:hover,.metric:hover,.service:hover,.case:hover,.review:hover,.article:hover,.faq-item:hover,.timeline-item:hover,.panel:hover{transform:translateY(-3px)}
    .mobile-only{display:none}
    @media (max-width: 1024px){
      .hero-grid,.story,.contact-grid,.footer-grid{grid-template-columns:1fr}
      .grid-4,.grid-3,.grid-2,.flow{grid-template-columns:repeat(2,1fr)}
      .menu{display:none}
      .nav-toggle{display:inline-flex}
      .mobile-only{display:inline-flex}
    }
    @media (max-width: 720px){
      .container{width:min(var(--max),calc(100% - 22px))}
      .hero-main{padding:24px;border-radius:24px}
      .hero-meta,.grid-4,.grid-3,.grid-2,.flow{grid-template-columns:1fr}
      .section-head{flex-direction:column;align-items:flex-start}
      .fixed-tools{right:12px;bottom:12px}
      .floating-contact{left:12px;right:12px;max-width:none}
      .nav-actions .btn-ghost{display:none}
    }
    .mobile-menu{display:none;padding:0 0 14px}
    .mobile-menu.open{display:block}
    .mobile-menu .menu{display:grid;grid-template-columns:repeat(2,1fr);gap:8px}
    .mobile-menu .menu a{background:#fff;border:1px solid var(--line);text-align:center}